**How to solve Primary 4 heuristic problem sums involving Decimals?**

John and Peter had an equal amount of money at first. After John received $108.40 from his father and Peter spent $66.20, John had thrice as much money as Peter. How much money did they have altogether at first?

**Solution.**

3 units − 1 unit = 2 units

108.40 + 66.20 = 174.60

2 units = 174.60

1 unit = 174.60 ÷ 2 = 87.30

87.30 + 66.20 = 153.50

153.50 + 153.50 = 307

**Answer: $307**

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